Introduction
============
Aloadimage is a simple command-line imageviewer for arcan, built on the image
parsers provided by stb (https://github.com/nothings/stb). Image loading is
performed in the background as a separate, sandboxed processes and should be
reasonably safe against maliciously crafted input sources.

The primary purpose is to provide an arcan- specific replacement for
xloadimage, and to serve as a testing ground for advanced image output such as
full HDR- paths. The secondary purpose is to craft the image- loading worker
pool to be secure and efficient enough to act as a building block for other
components within the Arcan umbrella.

For more detailed instructions, see the manpage.

Building/use
============
the build needs access to the arcan-shmif library matching the arcan instance
that it should connect to. It can either be detected through the normal
pkgconfig, or by explicitly pointing cmake to the
-DARCAN\_SOURCE\_DIR=/absolute/path/to/arcan/src

The appl- that arcan is running will also need to expose an appropriate
connection point (where you point the ARCAN\_CONNPATH environment variable)

         mkdir build
         cd build
         cmake ../
         make
         ARCAN_CONNPATH=something ./aloadimage file1.png file2.jpg file3.png

Optional Dependencies include:
- Exempi-2, used for VR180 in JPG decoding
- Seccomp, used for sandboxing on linux

Status
======
 - [x] Basic controls
 - [p] Multiprocess/sandboxed parsing
   - [x] Expiration timer
	 - [x] Upper memory consumption cap (no gzip bombing)
	 - [x] Seccmp- style syscall filtering
	 - [x] Pledge port
	 - [ ] Capsicum port
 - [ ] Playlist
   - [x] Read/load-ahead
   - [ ] Handover launch everything at once
 - [ ] VR image formats
   - [x] left-right eye mapping
	 - [ ] projection metadata (fov + geometry)
	 - [ ] auto-sbs detection
	 - [ ] packed image format support (adobe metadata)
 - [ ] Color Accuracy
   - [ ] sRGB to Linear swapping
	 - [ ] full FP16 format with scRGB
	 - [ ] ICC profile output
	 - [ ] HDR metadata (range, ...)
 - [ ] Up/downsample filter controls
 - [ ] Subpixel hinting for vector formats
 - [ ] GPU acceleration toggle
 - [ ] Per image transformations (rotate, flip, ...)
 - [ ] Internationalization
 - [ ] Interactive mode
   - [ ] Placeholder 'reset' playlist entry
   - [ ] Drag/zoom/pan input
	 - [ ] Scrolling (CONTENTHINT)
	 - [ ] Announce extensions
   - [ ] Handle BCHUNKSTATE/drag'n'drop/paste
   - [ ] Window clone action
   - [ ] Expose command-line options as ARCAN\_ARG
 - [ ] Stream-status/Content-position-hint
 - [ ] State support (save playlist, configuration)
 - [ ] Thumbnail window
 - [x] Basic Raster Images (via stbimage)
 - [ ] Formats support
   - [ ] Animated GIF
   - [ ] Vector contents support
   - [x] Load/Draw Simple SVG (need refactor, assumes endianness)
   - [ ] Redraw / invalidate on DISPLAYHINT